thingiverse

free

Mpow A1 bluetooth neckband clip by joochung

... one. smaller hole diameter is ~ 2mm. the gap in the smaller hole is ~ 1mm. the larger hole diameter is 5.5mm and the gap is 3mm.

thingiverse

free

Bluetooth Box Donerton by ChrisH90

...or this it seems much more louder than the original. box:https://www.amazon.de/dp/b084vj88th/ref=cm_sw_em_r_mt_dp_u_-a0geb3qmynae

thingiverse

free

Microsoft Bluetooth Mobile Mouse 3600 Foot by TheKre8Group

...ded across my desk. i used double sided tape to hold the foot in place, fixing it to the top skin (bottom skin against the desk).

thingiverse

free

Keyboard Stand for Logitech K810 Bluetooth Keyboard by dehart007

...nds for the keyboard that inclines it. because this keyboard is portable i wanted something that was easy to use and transport.

thingiverse

free

Mini Bluetooth Stereo Speaker by project3dprint

...roject3dprint.com for direct links to purchase the electronics yourself for this project. in the mean time you can get printing!

thingiverse

free

Microsoft Bluetooth Notebook Mouse 5000 Battery Cover strong remix by jerryciano

...osoft bluetooth notebook mouse 5000 designed by targeos with more strong tabs added. to be printed with supports under the tabs.

thingiverse

free

Bluetooth compact speaker by MikDandy

...hm-3w-full-range-speaker-for-mini-stereo-loudspeaker-box-diy-accessories/32715542233.html?spm=a2g0s.9042311.0.0.iaarh5 switch....

thingiverse

free

Bluetooth audio+FM player by J_RPM

...pla is also built to mount this audio player on top of the wooden box. previous version:https://www.thingiverse.com/thing:2818757

thingiverse

free

Motorbike Bluetooth Antenna Guard by bardatwork

...added a new version that extends all the way to the base as the antenna itself was breaking with the older version in tow..... :(

thingiverse

free

SoundBot SB571 Bluetooth Speaker Magnetic Holder

...eakers. i used these diymag 1.26 inch diameter magnets. https://www.amazon.com/dp/b06xd2x45m/ref=cm_sw_em_r_mt_dp_u_f.btdbcwhsr78

thingiverse

free

Nintendo Switch-Giveet Bluetooth Adapter Bracket

..._yo_dt_b_asin_title_o00_s00?ie=utf8&psc=1). tight tolerances with the cable keep the adapter securely in place on the switch

thingiverse

free

bluetooth BOOMBOX new mini case by priority

...5&algo_expid=a1b6f7d8-ebc2-4da8-a4e0-35960d31ce9c-13&algo_pvid=a1b6f7d8-ebc2-4da8-a4e0-35960d31ce9c&pricebeautifyab=0

thingiverse

free

Case for DPS-5005 Bluetooth module by HarpieC

...irst "usefull" thing done with my first 3d-printer, comments welcome. link to latest fusion file http://a360.co/2ezqhyt

thingiverse

free

2 in 1 phone (ASUS T00j) and bluetooth speaker holder by Lydmetalis

...s speaker holder you can use this phone holder:http://www.thingiverse.com/thing:1694183 all parts printed with standart setings.

thingiverse

free

360° Bluetooth Portable Speaker by Hononga_AB

...3.7v 5000mah battery li-po: here 5v lithium battery charging module: here usb 2.0 a male to mini: here on/off rocker switch: here

thingiverse

free

MPOW Bluetooth Adaptor Case/Button Guard by poor_red_neck

...s://www.amazon.com/mpow-bluetooth-receiver-streaming-hands-free/dp/b008agqmqc/ may fit the newer version but i can't confirm.

thingiverse

free

3d scan of an android bluetooth speaker (1st ever scan from me) by davesladeuk

...thingiverse first ever test scan on my xyz printing 3d scanner was of an android bluetooth speaker that was just hanging around.

thingiverse

free

Raspberry Pi 5" Screen for Bluetooth handheld controller by nazmus

...r it to be caught on the bluetooth controller. you can see a video of this in use at https://www.youtube.com/watch?v=yy_8oqxvdx4

thingiverse

free

Bluetooth Focus Horizon zero dawn by SunGear

...ill need some material removed for it to work. a scalpel will make quick work of it. the top cover is tricky to print. good luck.

thingiverse

free

Apple Bluetooth Keyboard Phone Stand by ljblk

...a nexus 6 and iphone 6+ in a case. you will need to print a left and a right version, i've only included a file for one side.

thingiverse

free

Casing for TDA7492P Bluetooth Audio Amp. by Sebizarro

...ff button. updated 25.08.2018 - for tda7492p on/off push button. http://www.instructables.com/id/reuse-old-speakers-for-under-10/

thingiverse

free

Bluetooth module enclosure for SANWU 25W+25W TDA7492P Wireless Bluetooth CSR4.0 Audio Digital Receiver Amplifier Board Updated Version by cyberbidouille

... into the base. you may want to add a litlle acrylic cylinder to conduct the blue led light. plug power supply.and enjoy music...

thingiverse

free

Soundpeats / Jogger / QY7 Bluetooth earbud case by Jimbob

.../ qy7 bluetooth earbud case by jimbob thingiverse case for qy7 earbuds. print with opening facing up, supports already included.

thingiverse

free

Apple Mighty Mouse (Bluetooth wireless version) by roflowhale

...luetooth wireless version) by roflowhale thingiverse 3d scan of the apple wireless mighty mouse. scanned using the artec spider.

thingiverse

free

AIYIMA TPA3116 Pioneer 600 Active Speaker Upgrade. Bluetooth Panel Module

...ve speakers bluetooth aiyima tpa3116 module:https://www.aliexpress.com/item/32888496393.html?spm=a2g0s.9042311.0.0.27424c4d5srfx4

thingiverse

free

Mini ELM 327 Bluetooth thinner shell by azure93

..._2&algo_expid=87bd930c-d243-478b-88a3-d5a459423dac-2&algo_pvid=87bd930c-d243-478b-88a3-d5a459423dac&pricebeautifyab=0

thingiverse

free

Portable Bluetooth Speaker - Bike Mounting Clips by RetroRocket

...x%3ait&var=431624468842&_trksid=p2060353.m2749.l2649 they will work on any 65mm cylinder and utilize sturdy 5mm zip ties.

thingiverse

free

Xiaomi Bluetooth Humidity Sensor Holder by ThePirer

...se just a holder for the new xiaomi humidity sensor. pretty straight forward to print, just rotate the model. the screws are m3.

thingiverse

free

Bluetooth Headphone Receiver by project3dprint

...roject3dprint.com for direct links to purchase the electronics yourself for this project. in the mean time you can get printing!

thingiverse

free

Apple Bluetooth Keyboard End Caps by bbum

...e to print the piece for the other end. or just print one and take it off when you use the keyboard such that it remains level.

thingiverse

free

Bluetooth wireless for RAMPS 1.4 by sakunamary

...tm?spm=a230r.1.14.26.bni2em&id=17759571300 .dear friends who want to get the bt module pls check it out from ebay or amazon .

thingiverse

free

Bluetooth Smart Remote - Car Steering Wheel Mount by Vargr

... i purchased a bluetooth remote controller. i didn't like the steering wheel clip that it came with , so i designed this one.

thingiverse

free

Base for Ultimate Ears BLAST Wifi/Bluetooth Speaker by ontherunstudio

... provides storage for the waterproof seal and d-ring accessory screw. additional parts: 1 x right angle micro usb charging cable.

sketchfab

$10

BZ-MC1583B Bluetooth CD Alarm Audio Speaker

...bj .gltf .fbx .blend - bz-mc1583b bluetooth cd alarm audio speaker - buy royalty free 3d model by interior model (@interiormodel)

thingiverse

free

Xbox Console Streaming bluetooth controller game clip

...access. better tightening tool you will need the other parts from the original creator (see remixed from link) print on its side.

thingiverse

free

Music Box Player MP3 Bluetooth Portable by PetitsAteliersDecouverte

... playing time ! high quality design ! the sturdy handle makes this player a companion through thick and thin. usb power charging.

thingiverse

free

Moto G + NES30 Bluetooth Controller Holder by andyleer

...motognes30clip 3 - has an extended back piece and modified grab on the nes30 -both should have space for some sticky back foam.

thingiverse

free

Gramophone for smartphone, crystal radio and bluetooth by cheungbx

...spot.com/2020/10/gramophone-for-smartphone-crystal-radio.html and my youtube video for more details. https://youtu.be/gwoco-nx5ve

thingiverse

free

Bluetooth Motorized Camera Slider Feet by disruptityourself

...work great with ninjaflex or similar filaments. i'll upload the design file too so you can change it and not start from zero.

thingiverse

free

DIY Bluetooth Fire Pit Speaker with Sound Reactive Flame by mrme88

...4khhythsze there's also an instructable: https://www.instructables.com/id/fire-pit-with-sound-reactive-flame-bluetooth-speak/

thingiverse

free

PVC Bluetooth Speaker

...qlkkws5a2a&keywords=12v+power+supply&qid=1569933646&s=lawn-garden&sprefix=12v+power%2clawngarden%2c160&sr=1-4

thingiverse

free

TDA7492P Bluetooth Amp Case w. ears by Fasterpast

...92p bluetooth amp case w. ears by fasterpast thingiverse same thing but i like to have mounting "ears" outside the box

thingiverse

free

Audio TV Box Bluetooth & Battery by jangy83

...hingiverse processing base for the recycling of audio boxes from old tvs -print with pla -created joint for protective wire mesh

thingiverse

free

Bluetooth Voice Controlled Moving Lamp by NikodemBartnik

...ng your lamp with your voice, you want to solder more efficient or you are such a lazy person :) this project is perfect for you!

thingiverse

free

Sure hifi AUX APT-X Bluetooth 4.0 board case by yoseikan

...d and the output is loud and crisp. small 2mm wood screws fit fine in this. hope this case is useful for someone. my first share!

thingiverse

free

Turnigy 9xr Pro Battery and Bluetooth module holder case by ageiron

...ng 1500mah life transmitter battery tight in place, the cables tidy and it can also hold a hc-05 / 06 wireless bluetooth module.

thingiverse

free

Bluetooth controllable Volkswagen Bus

...mhgw modding a servo for continuous rotation, the right way: https://www.instructables.com/id/the-cheap-and-easiest-robot-motors/

thingiverse

free

3D Printed Bluetooth Headphones - Version 2

...irable. for more comprehensive instructions, the latest updates to the design and cad source files see www.homebrewheadphones.com

thingiverse

free

Securing Clamp for Bluetooth LED Controller by MrBreakfast

...e (you can also hot glue this for extra-secure fit). those 4 pins won't be disconnecting or breaking any time soon now >:d

thingiverse

free

Bluetooth stereo by Rex3DPrinting

...without usb maunts update 2: added: plastic frame used fort the prototype. (in case you cant/dont want to cast an concrete frame)

thingiverse

free

stand for bluetooth speaker t&g116 (tg-116) by nic_raven

... aliexpress. i've created this for anti-rolling and anti-falling damage prevention. speaker: h80 d85 l190 stand: h28 l147 l67

thingiverse

free

OPlink case with room for hc-05 bluetooth module by Johnny1070

...have a jr port. added a flat back for it, not the jr system, and fits between the handle of an i6s style controller, as pictured.

thingiverse

free

BlueTooth-Keyboard-Adapter

... this two pieces, rise a bit the screen to let you touch all the screeen, better view angle and looks nice =) print and enjoy..!!

3dbaza

$4

Major two Bluetooth headphones (330916)

...gt;polys : 597 586  <br>verts : 595 604<br>- three headphones :<br>polys : 1 792 758<br>verts : 1 786 812

thingiverse

free

High Power Bluetooth Speaker! by JK199180

...roughly $150. parts from partsexpress and amazon. see the new information on this thing:https://www.thingiverse.com/thing:4641529

thingiverse

free

Bluetooth modem PCB holder by johnbiehler

... i'd have a little room at the end for solder points. this is a derivative of http://www.thingiverse.com/thing:5396 as well.

thingiverse

free

Bluetooth LED Panel “Palantir” by atlantisq

... orthanac is available only for android. project webpage: https://atlantisq.wordpress.com/2021/06/07/obj-2701-led-panel-palantir/

thingiverse

free

Headphone folding unit Bluetooth (HARPER HB 402) and many other Chinese headphones by KirillKH

...ngiverse harper hb 402 bluetooth headphones. many other chinese headphones. headphone folding unit. узел складывания наушников.

thingiverse

free

Carabiner Case For Xiaomi Mi Compact Bluetooth Speaker 2 by gcomdatall

...eight. or outdoor travel full print with 120x60x40 walls/top/bottom and 10% infil came to about 57g in weight. enjoy with it . :d

thingiverse

free

Clips for Apple Bluetooth keyboard (ipad keyboard) by tom7

...rcise workstation! there's both a left-hand and right-hand version; you should print with the hooks touching the build plate.

thingiverse

free

Can Am Maverick X3 Bluetooth speaker mount by nondem

... above and behind the drivers head. in my normal driving position the two speakers position give the stereo effect of headphones.

thingiverse

free

Sony MDR-V6R (MDR-V6 remix with bluetooth) by jyvet

...ose a nfc tag in the right ear piece for faster pairing. original earpads were replaced by brainwavz hybrid memory foam earpads.

thingiverse

free

Fender DIY bluetooth speaker guitar amp by Nickontiki

...nted it without top/bottom layer and using grid infill. grid and fender logo printed together with filament change cura function.

thingiverse

free

Marquant Bluetooth speaker top cover by bazic

...cover for marquant bt speaker (very popular & chip device) the goal is to divide electronic board from speaker & battery.

thingiverse

free

Bluetooth earphone Neck Band by MasterKam

...200) . i printed this the below specs. layer height 0.15mm support : yes material: pla if you find it useful please update count.

thingiverse

free

JB Bluetooth Speaker by MrBubbles

...ut -clambs for other passiv speaker -when doing right rain proof -100h battery live (only music) by questions please tell me them

thingiverse

free

Portable Bluetooth Stereo Speaker by project3dprint

...roject3dprint.com for direct links to purchase the electronics yourself for this project. in the mean time you can get printing!

thingiverse

free

Mpow BH129 Bluetooth Reciever holder

...y car. you can use what ever you think would stick the best, but if you decide to go with hook and loop, it'll work just fine

thingiverse

free

TPA3116 Bluetooth amplifier enclosure by isakh1

...de diameter to clean the upright pins of the bottom plate. note 3: clean all the button pins for any irregularity on the outside

thingiverse

free

Enceinte portable stéréo bluetooth by mooocan

...uvoir être imprimés sur une prusa mini mais vous avez aussi le fichier fusion 360 si vous souhaitez faire un découpage différent.

thingiverse

free

Mood Lamp with Alarm and Bluetooth by Circuitdigest

...code and more explanation at: https://circuitdigest.com/microcontroller-projects/smart-phone-controlled-arduino-mood-based-lights

thingiverse

free

autodetection bluetooth setup on arduino. by jamesvilleneuve

...st set it for 57600, no ending lines, and it will instruct you what to do next. video here www.youtube.com/embed/wtpqc1pasqy

thingiverse

free

Mp3 FM Bluetooth module case for speaker

...e help of soldering iron. the other 4 holes in the case are m3. 2 pcs m3 x 10mm 2 pcs m3 x 16mm to mount the case to 6mm plywood.

thingiverse

free

BlueTooth Speaker 2" Box-Type by waho

...ntersunk screw of m3 * 8~10l / 9ea speaker fixing screw recommended for lengths of about 8 mm or less in size of m3 / 8 required

thingiverse

free

Bluetooth earmuff/ear protector parts by cperiod

...for symmetry. note: the scad requires a relatively recent version of openscad supporting the angle parameter on rotate_extrude().

thingiverse

free

AUKEY bluetooth holder for Beats Mixr by SoulOfNoob

...ke a mounting adapter for my headphones :d . printed with: 0.1mm layer height 0.4mm nozzle 4 loops wall thickness 30% infill pla

thingiverse

free

Bluetooth Holder for Mini Cooper Countryman vehicle by MDheliMech

...ng assembled. however in my experience so far it would be better to print the file that has the parts separate and glue together.

thingiverse

free

Portable Bluetooth Speaker

...cations to suit your setup. check out my youtube channel to see the this in the makinghttps://www.youtube.com/watch?v=ujlde_jlmeg

thingiverse

free

Bluetooth Mini Track Loader Cockpit Man by Backmann

...ts. in his back he has a cutout for the on/off switch. i'm planning on trying to paint him. i will post pictures if i succed.

thingiverse

free

Apple Bluetooth Keyboard Tablet Clip-Stand by lloo

...for me to use this on my lap. i've included the sketchup file in case someone wants to customize it to fit their own tablet.

thingiverse

free

Flipper battlebot/bluetooth controlled bot by teundedonder

...e female jst-xh connector turnigy nano-tech 300mah 2s 35-70c 7,4v lipo 2 ebowan n20 6v 500rpm micro gear motortjes 3a mini switch

thingiverse

free

Ardupilot Pixhawk Bluetooth Module Mount (PCB ZS-040)

...ll holes for the status led and the button (if there is one). module size and inside dimensions of the case are 37.5 mm x 15.5 mm

thingiverse

free

Photive Hydra Bluetooth Speaker shower rod clips by Yeahdog05

...s sound great up close to why not hang it by your head in the shower! or when working on your 3d printer that's under a rack!

thingiverse

free

Xiaomi Bluetooth 4.0 speaker feet / corners protector by MOSFET_burnt

...2 little grooves to save the original feet. i glued four rubber pads recycled from a router or something to make it less slippy.

thingiverse

free

Bluetooth Charger Station by DanLuc

...yes closed, or not if your driving. it also has an indent on the bottom and back for the cable to neatly go underneath the stand.

thingiverse

free

Bluetooth speaker - " Hi-Fi stereo boombox " by Tupuh

...ml power switchhttps://www.aliexpress.com/item/4001165826718.html embedded nutshttps://www.aliexpress.com/item/4000585933306.html

thingiverse

free

TV remote Bluetooth speakers by JD_Printing

...se did. i was able to use the supplied hardware to mount everything, except used a glue gun for the speakers. hope you like it.

thingiverse

free

Plantronics 855 Bluetooth Case by lonertic

...coffee at https://www.buymeacoffee.com/thestan. optional of course but kindness makes the world a better place :). thanks, enjoy!

thingiverse

free

Bike mount for JBL GO2 bluetooth speaker

...t your jbl go2 to your handlebars or other round surfaces using cable ties ps: you may have to upscale the .stl by a factor of 10

thingiverse

free

Arduino bluetooth controlled modular robot by DZ_DIY

...n arduino based modular robot. you can create your own module to improve the amount of things the robot can do and have more fun!

thingiverse

free

Bike mounting device for Bose® Bluetooth® SoundLink® Colour speaker by didoo

...ice was designed to be used with garmin® edge® bike computer mount. i actually use it with k-edge® stem mounting. it works well !

thingiverse

free

Gramophone for smartphone, crystal radio and bluetooth Round by cheungbx

...spot.com/2020/10/gramophone-for-smartphone-crystal-radio.html and my youtube video for more details. https://youtu.be/gwoco-nx5ve

thingiverse

free

Battery powered bluetooth speaker by mmOne

...itial post. v1.2: improved housing rigidity, optimised grill recess. v1.3: optimised lip "seal". added printable grill.

thingiverse

free

TDA7492P bluetooth amplifier encloser by sveininge79

...black-10-9-alloy-steel-button-head-hex-socket-cap-screw-bolt-/222066527965?var=&hash=item33b4324edd:m:mamnne3gshbwimnne7tci0a

thingiverse

free

Miniature BK8000L bluetooth receiver

... to edit original inventor file to set dimensions of your parts! it's all in single sketch. overall project cost is around 5$

thingiverse

free

BlueTooth music speakers by ThorLAB

...er me a coffee!, it will be an extra motivation to continue designing. thanks to google translator for help with translation. ;)

thingiverse

free

Bluetooth Comm Badge by Superjag

...it does have a microphone for (hopefully) improved call quality on the other end, and an instant voice-dial / answer call button.

thingiverse

free

Portable Bluetooth Speaker - with Handle & 5s2p batterypack & sub by gotz

...g push-button https://bit.ly/3w2l5hf passive radiator: https://bit.ly/34zmksg lenovo dc power jack socket https://bit.ly/350fbcn

thingiverse

free

Bluetooth Headset Tacoma Vent Holder by Donorcyclist

...y significantly in 2005. other bt headsets will probably work with this, as well. don't forget to use supports when slicing!

thingiverse

free

bluetooth headset ear hook replacement by Kofu

... different but it does the job. it's not impossible you need to adjust the clip (use a sharp blade or an old solder iron).

thingiverse

free

Holder for NAIKU Wireless Handsfree Bluetooth

...cond one, because the first get worn out due the heavy usage and bad storage in backpack. step-file provided. link to aliexpress.

thingiverse

free

NFC-WiFi-RFID-Bluetooth-Radio Signal-Statusbar bars by Pilotkid2015

...-bluetooth-radio signal-statusbar bars by pilotkid2015 thingiverse this is a simple 3 status bar symbol with 17x20x5 dimensions.

thingiverse

free

180 rotating Bluetooth speaker by marceloajunqueira

...or each side. i would reccomend to print using 100% infill to reduce vibration. +- 260 grams of filament to print the entire box.

thingiverse

free

18+ Bluetooth Speaker by TB_3D

...tblack3dprinter/ -cults3d : https://cults3d.com/en/users/tb3d/creations -myminifactory : https://www.myminifactory.com/users/tb3d

thingiverse

free

Zealot S1 Bluetooth speaker bike mount by BubaLettow

...pone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011547&hvtargid=pla-570216210405&psc=1

thingiverse

free

ZK-502C 2x50W Bluetooth amplifier Case by Reddrago789

...es the originally provided bottom plate and 4 m2 screws. i tapped the holes in the pcb supports, be sure not to overtighten them.

thingiverse

free

Ear clip for Sony VH110 Bluetooth Headset by Hexwizz

...he same size as the original headset clip, way to tight for me. the earclip larger - file is scaled up 10% and fits me perfectly.

thingiverse

free

supporto bluetooth da tavolo hi-fi by Ma_Che_Wood

... proprio apparecchio al mio è stata modificata la portata delle batterie aumentando notevolmente la qualità e la durata nel tempo

thingiverse

free

Bluetooth Laser Keyboard Stand by Mystereon

... edit : scaled it up a tiny bit from feedback, is now a larger easyfit version at 103% of original. it works a treat:)

thingiverse

free

Ipod Classic Bluetooth Case by Slenderman1198

...for ease of adhesion. i also recommend using full supports. i had the best results while using an ultimaker on preferred slicing.

thingiverse

free

Bluetooth 4.2 Speaker 2x5W Stereo STEP by LGS231

...y lgs231 thingiverse i really like the design but want to make some changes, so i reversed all the part to get the cad drawings.

thingiverse

free

Nautilus Spiral Bluetooth Speaker by JustAmaze

...e stand, a circular engraved text which a couple of words to celebrate my sister's birthday thus this was made a gift for her

thingiverse

free

BlueTooth Box by pinakoza

...e gun please note: buttons stl file prints 5 press buttons that you need to place it in case before installing the circuit board.

thingiverse

free

Bluetooth FM/SD/USB player on wall bathroom,kitchen by ceklis

...4c4drb1agd this is a purchased wall playerhttps://www.aliexpress.com/item/4000473937654.html?spm=a2g0s.9042311.0.0.27424c4dvlifyz

sketchfab

$4

Bluetooth Speakers GameReady- LowPoly PBR

...appliances and electronics collection - bluetooth speakers gameready- lowpoly pbr - buy royalty free 3d model by abdelrahmanahmed

thingiverse

free

Bose QC3 Bluetooth Adapter by watersb1323

...e. i printed all three pieces at nominal 0.16mm with adaptive layering option in cura. you will need support for the mpow holder.

thingiverse

free

Xiaomi Mijia Bluetooth Thermometer support with hook by AlexisLah

...gn to hold the xiaomi mijia thermometer to anything with a simple hole. it won't slip. print with supports (easily removable)

thingiverse

free

Boitier pour récepteur audio bluetooth SANWU® by sylrigs

...sanwu® by sylrigs thingiverse une pastille de plastique opaque a été mise sur le trou pour diffuser la lumière bleue du système.

thingiverse

free

Emtec Stay bluetooth headset earbuds clip by thisguyaves

.../battery node of the emtec stay headset, keeps it attached to your collar instead of flailing around and pulling the earbuds out.

thingiverse

free

TREKZ TITANIUM Bluetooth headset holder by CoPOrt

...r horizontally with headset. estimated printed time : 2hr (80m/s) trekz titanium : https://aftershokz.com/products/trekz-titanium