3d_export

$15

gaz-aa

...yres: 6.50-20 inches. fuel capacity: 40 l weight: 1810 kg maximal speed (highway, loaded): 70 km/h fuel consumption: 20.5 l/100km

3d_export

free

Aston Martin V8 Vantage V600

...adge and chrome surround on the grill. 56 customers opted for the v600 package with another 25 cars built up as special projects.

thingiverse

free

25 slot reloading tray for .410 bore shotgun shells by Gamma_Ray

...sary. print four spacers, of course, and they may stay with a friction fit. i glued mine though, using cement that works for pla.

thingiverse

free

LSD-25 3D model by alanlane77

...lsd-25 3d model by alanlane77 thingiverse made this while bored, please enjoy! sending good vibes

thingiverse

free

24 Tooth Drive Sprocket by qwertyboy

...24 tooth drive sprocket by qwertyboy thingiverse a 24 tooth drive sprocket with a 3/8" bore for #25 roller chain.

thingiverse

free

Ender 3 v2 belt tensioners by tom_sim

...nder 3 v2 belt tensioners by tom_sim thingiverse your will need, pulley bore 5 mm, belt 6 mm, with teeth. m5 bolt 25 mm. m5 nut.

thingiverse

free

Helical Miter Gear Set 25mm Pitch diameter by Virtualinsanity

...u i could upload one actually at 5mm.) bore edit = loaded without bore or set screw hole also has a 3mm set screw (3.1mm actual.)

thingiverse

free

4" Bow Roller for Boat Trailer by Sandman1775

...brim and no supports. v2: (.525 thru bore) 20% infill, 2.2mm wall thickness, .28mm layer height, brim and no supports. i used pla

thingiverse

free

Door handle spacer by electromdc

...s the handle mechanism centered in a standard bore door hole. it is a snug fit. printed on cr10. no supports needed. 25% infill.

thingiverse

free

Cool Potential Keychain/knick knack

...int to use as a key chain or desk decoration or anything that floats your boat. i recommend probably printing at about 25% scale.

thingiverse

free

3/8" Hex to .25" D-Shaft Adapter for AndyMark Compliant Wheels by RoboticDoges

... andymark compliant wheels, which have a default 3/8" hex bore. used and tested in a first tech challenge (ftc) environment.

thingiverse

free

Hexagonal Mirror Clip by OpenLab

...d try using openscad and designing something that i wanted to print, and 25% so i could have mirror clips that aren't boring.

thingiverse

free

Aluminum Flexible Coupling/Coupler Helical Shaft 5mm x 8mm by TinkerJohn

...ns needed, please let me know through the comments. any new design needed, please comment that too. i'm always happy to help.

thingiverse

free

Knurled Grippy Cardboard Screw v4 Makedo & Technic Pin Compatible by jendenuvaden

...ke velvet butter on your fingers and increase grip by at least 1000%. print at 25% & 0.12 layer height for maximum strength.

thingiverse

free

Tronxy P802E X Axis Belt Tensioner by nipnbite

... than the large tronxy bearing. you will need (2) 4mm x40mm bolts (4) 4mm nuts (1) biqu-h303 (1) 5mm locknut (1) 5mm x 25 bolt

thingiverse

free

gears 1 inch bore by dodgeme

...esitate to message me as i will do my best to respond in a timely matter with any info you may need. tips are always appreciated

thingiverse

free

4L60E, 4L60, TH400 Pump rear ring resizer tool by keith20mm

... it down over the two rear seals, allowing it to sit for about 15 minutes, then remove the resizer and install the pump assembly.

thingiverse

free

Silencer (Suppressor) by 3dcave

... mm airguns) bore length: 138.5 mm casing length: 120 mm i also modeled a small version of it which has a casing length of 60 mm.

thingiverse

free

Daily Equation #14 - Parabola - y = a*x^2 by skaye

...or people lose interest. if there's a particular equation you'd like to see, leave a comment and i'll give it a shot.

thingiverse

free

Parametric Golden Spiral Fan Duct v0.2 by EStrad

...result in: 40mm cpu fan form factor m3 screw bores approximately 25% reduction in diameter 5 fins 10mm od...

thingiverse

free

Corner Roundover Template R2 by LooseArrow

... on the original by doing away with the outer perimeter and has a hanging hole in the middle. hope this one proves handy for you.

thingiverse

free

P3steel Lightbar for Bed by tbeaulieu

...little taller still which would be an easy tweak. redesign 04/25/2018 i couldn't resist. lengthened it. like much better now.

thingiverse

free

Zheng3 Penny Bombard by zheng3

...llenge is still active, with a new model behind the crypt door. http://www.zheng3.com/2012/06/25/cryptstone-challenge-000-update/

thingiverse

free

Hypercube Single Z motor, dual leadscrew

...+mm and you get 940, i just rounded up to 1000mm for a little extra. its better to have a belt slightly too long, than too short.

thingiverse

free

Modest color base for modeling by Giovanni1965

... you use the base with bearings you have to insert a thickness between the two pieces, i got it with two m4 nuts drilled to 5 mm.

thingiverse

free

Star Wars Legion Hut by ricktress

...only, and is not included. version 02 has 2.2mm bores for paperclip wire, and 3 parts. this is in-case...

free3d

$89

Tunnel Boring Machine Cutterhead

... if needed. also check out our other models, just click on our user name to see complete gallery. 3d_molier international 2019

thingiverse

free

Dry-box filament pass through, with filter by Bpendragon

...rybox wall, minimum will be about 20mm, i recommend 25-30 and trim if needed) m3 nuts, count depends on how many screws are used.

thingiverse

free

Unremarkable Shelf Leg for scrap wood shelf by Robert_White

...ome wood screws of your choice, screw driver, and a scrap 3/4" board. 15%-25% infill is plenty strong for most applications.

thingiverse

free

Hesine A8-B LCD Box LCD-2004A Screen by sethrocon

...%25 infil 50mm/s i know the hesine machine is newer and doesn't have a lot of support so i hope you enjoy this mod. thanks.

thingiverse

free

Shadeling's New Printer (RB MK-2) by Shadeling

...gantry) steel machinable-bore sprocket for ansi number 25 roller chain, 1/4" pitch, 9 teeth pn: 6793k1 qty 12 (z axis)

thingiverse

free

31" spoil board with dovetail clamping slots by muddyfeet

...these clamps: oops clamps: https://www.thingiverse.com/thing:4584289 toe clamps: https://www.thingiverse.com/thing:4584288

thingiverse

free

Collatz Conjecture Towers by Chrisibub

...ame objects with more numbers and more iterations, please let me know, i´m ready to design your wishes of the collatz conjecture!

thingiverse

free

OnStep for Seben EQ3 mount by RomanHujer

...l eq telescope mount onstep for sky-watcher eq5 mount my diy telescope wood tripod upgrade for telescope with eyepiece plate

thingiverse

free

Ender 3 BLV Bed Sled Carriage Mod for Dual Y axis Linear Rails by BoneCrusherPLT

...tor titan stepper motor for titan extruder /3d printer extruder 42x42x23mm diy cnc for j-head bowden with 1m cable and connector)

thingiverse

free

GREMLINS by RogerMatua REMIX by adry82

...it is 10 cm high but you can resize it . 200% 20 cm , 300% 30 cm etc... . printed using a few supports. use the raft for the pins

thingiverse

free

Compact Bowden extruder, direct drive, bearing bloc, auto load 1.75mm filament by scarou

... pushfit_builtin support.stl update 25-06-2016 : as requested, added c_b_e_mk8 - 2 pushfit - no braket - with builtin support.stl

thingiverse

free

Cornet Valveless by rzirin

...his valveless cornet, i will be releasing a cornet assembly with working valves based on the same cad files. have fun printing :)

thingiverse

free

Short-Point Colouring Pencil/Pencil-Crayon Sharpener Adapter by scruss

... customizable fancy pencil holder with the following parameters: number_of_pencils = 24; slope_angle = 25; pencil_diameter = 8.2;

thingiverse

free

Stepper motor with worm gear for operation of air valve by Soeren_Stobbe

...th some metal part, but i did not have one and wanted to print as much as possible of the parts. and it works like it is, anyway.

thingiverse

free

Fidget Cube by CThig

...ect size 10/23/16 fixed switch to make it stay on better made finger indention a little bit deeper could be changes in the future

thingiverse

free

Gear set for cutting 10 pitch on a Hardinge TL by Weldingrod1

... good idea. i was able to cut the 10 pitch aluminum thread i needed using these without any visible damage on the teeth or bore.

thingiverse

free

Guitar Rest Desk Mounted by toekneebullard

.... any stringing from not having support is pressed into place once you put the screws in. let me know if you have any questions!

thingiverse

free

4th axis in wood by ANicolai

...s 1 - m10 x 90mm hex bolt 1 - m10 nut 1 - m10 washer 4 - 1/4 x 20mm bolt 4 - 1/4 nuts 6 - m3 x 12mm socket cap screws 6 - m3 nuts

thingiverse

free

Ender 3 BLV Bracket mod dual y axis by BoneCrusherPLT

...7, and 47.5mm 47mm is the best bet, 47.5 is what i use but could be tighter. don't over tighten or you will restrict motion.

thingiverse

free

Continous Light to Softbox adapter by Spike19

...self did not encounter any significant heat buildup, but you need to check and ensure safety yourself for your given combination.

thingiverse

free

InMoov Stomach Helper Files by alansrobotlab

...dded recess for potholder. doh! 2016-01-25: tstomlowleft & right, deepened recesses for mount holes to stomsupport combined.

thingiverse

free

Llave para amoladora radial by babypeich

...evenly distributed at 90 °. the distance between opposing bores 180 ° is 30 mm, the holes being around...

thingiverse

free

Rotary 4th axis for CNC (MPCNC) by leo69

...x 1.25 x 20mm hex bolt $0.50/ea (4) m8 nuts $0.30 /ea (1) m10 nut $0.50 (1) m10 washer $0.50 (1) m10 x 1.25 x 90mm hex bolt $3.20

thingiverse

free

K40 (with wheels) Adjustable Bed by psaik

...ps://www.aliexpress.com/item/free-shipping-1pcs-lot-gt2-1140-closed-loop-rubber-2gt-timing-belt-1140-gt2-6-teeth/32791435275.html

thingiverse

free

prusa i3 extruder dual drive gear. not tested by motorimicro

...o 13 mm profondità 4,5 mm diametro cilindro tolto da 30 mm per fare spazio a ipotetici ingranaggi più grandi spostato di 36 e 58

thingiverse

free

Longboard Orangatang Kegel 34 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

non-grinding feeder for Ultimaker by jalr

...logged nozzle... -> fixed this by a aluminum part (see picture). maybe we could also fix this by modifying the printed parts.s

thingiverse

free

The Light Sky Bird Temple by JobSmolders

... if you have any questions, feel free to ask if you think i made a mistake or made some other kind of error, please inform me :-)

thingiverse

free

Linear Actuator large by Brucestephen

....dimensionengineering.com/ ) and simtools motion software ( https://simtools.us/ ). the next update will include mounting options

thingiverse

free

.177 suppressor for air rifles by AHitler

...was a real pain up the butt to align this one to the bore axis to avoid baffle strikes. the bottom 90% worked great for me, ymmv.

thingiverse

free

Longboard Orangatang Kegel 32 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

Longboard Orangatang Kegel 44 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

Longboard Orangatang Kegel 42 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

Longboard Orangatang Kegel 38 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

Longboard Orangatang Kegel 40 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

PVC pipe Nerf Stock with 5 degree drop

...ed, 4 walls 20% infill 0.2 layer height 10 bottom and top layers. seems strong enough but time and use will tell! happy nerfing!

thingiverse

free

CYBERTRUNK USB/PHONE STATION

...el speed: 30 z-hop when retracted: enabled cooling fan: 100% support pattern: zig zag support density: 15% filament brand priline

thingiverse

free

Longboard Orangatang Kegel 36 Tooth Pulley for 9mm, 12MM and 15mm Belt by JuniorPotato93

...e=juniour%20potato%20drive%20pulleys&item_number=jpdp¤cy_code=cad&bn=pp%2ddonationsbf%3abtn_donatecc_lg%2egif%3anonhosted

thingiverse

free

Bed leveling columns Anycubic i3 mega M/S by VSLab

... in diameter by 16mm high with 4mm inner hole and 8mm diameter upper inner hole, but keep free to change the size to your liking.

thingiverse

free

Electric Mountainboard by Fjederhaek

...for the batteries if you don't have any. i also recommend an antispark xt90 between the batteries and electronics. fjederhaek

thingiverse

free

Hengist Board Game Organizer Insert by Tesla5000

...rinter with no rafts or glue etc. print time ended up being 7 hours 38 minutes and it used 198 grams of filament (66.4 meters).

thingiverse

free

Pegboard Jig by PaganWizard

...g any 1/4 inch thick plywood, mdf, or other material. https://www.instructables.com/id/make-custom-pegboard-3d-jig-file-included/

thingiverse

free

Traxxas Spur Gear (for 2WD Traxxas cars) by DeepCarrot6859

...ing a couple and just replacing them when they wear out. i would not recommend this this to replace an already working spur gear.

thingiverse

free

Measurement of the Centripetal Force

...eibe 5,3x25) weights almost exactly 30g. (add some pieces of paper to get the exact weight, but i think, 29.89g ist good enough.)

thingiverse

free

Wonderland by Quintessenz

...ed with ... glue, obviously. they all fit on a 25 x 21 cm printbed without any problem. if there are any issues, just contact me.

thingiverse

free

Power Supply (PSU) Bracket Customizations by dewhisna

...ows for the clip length to be easily altered via new 'extracliplength' variable. see the discussion in the comments tab.

thingiverse

free

Customizable Prusa MK3 Y-axis Bearing Holder by inks007

...oticed excess wear and increasing play from my rj4jps (~ 4months), and switched back to the original lm8uus your mileage may vary

thingiverse

free

Omni-directional Wheel 140mm by Fillitup309

...embles so the all the nuts are on the outside. the button head screws give better clearance for the small wheel. 8 - enjoy :-)

thingiverse

free

The PrintBone v1.1: a fully printable playable trombone by pieterbos82

... with the correct amount of friction. use tuning slide grease. sand all the joints a bit. glue the parts together. happy playing!

thingiverse

free

Soda Can Crusher by TheFisherOne

...he handle to be a little shorter so that it would fit on smaller print beds. the lever now has 2 stl files that you can download.

thingiverse

free

cattail filament cleaner by sfk

...free printing, can pinch the sponge. the tow layers of bridging cutout should have a negligible effect on the foam filter medium.

thingiverse

free

Change gears (imperial) for EMCO compact 5 lathe by Stemer114

...icensed under the terms of creative commons attribution 3.0 unported.https://github.com/solidcode/mcad/blob/master/polyholes.scad

thingiverse

free

Rektify Mk.2 by Flygonial

...atform. created 41 and 40mm center distance cages for daybreak wheels, all options (15 vs. 14mm bore, dart guide) also available.

thingiverse

free

3:1 Geared Bowden Extruder by FerociousDesigns

...links are amazon affiliate links which means i get a small percentage if you use them. it does not increase the price you pay ***

thingiverse

free

WLtoys 12428 front shock tower by tjheikki

... under the bonnet anymore. a short video about my shock absorber movement with this part in youtube: https://youtu.be/d8oq1gy3sky

thingiverse

free

SMC Corp - CoreXY by smeric

...se with full graphic smart controller http://www.thingiverse.com/thing:516447 part for lcd control panel ( only front panel )

thingiverse

free

Anet A8 Belt Tensioner X-Axis by Digital_Sqrt

...ulley it does not fit or move well. 3/16/2018 - add bolt and nut sizes / linke to parts / fully tested 3/14/2018 - upload files

thingiverse

free

The PrintBone: a fully printable playable trombone by pieterbos82

...er height. the leadpipe is relatively bright. if you don't like it, increase the venturi diameter in the openscad file a bit.

thingiverse

free

VW ashtray Samsung S7 holder by brainwash

...at, it takes a couple of minutes. if you know your way around onshape, most of the dimensions are on "top view sketch".

thingiverse

free

Creality CR 10 500mm 300mm Frame Braces, spool holder and control box support by Pillage_then_burn

...ould be possible to do the same for the s4 and s3 with 976mm and 28t and 760mm and 20t but i haven't confirmed those numbers.

thingiverse

free

PseudoBot Filament Extruder by unotre

...es of 1/2"x1/8" angle were riveted to the rear housing to serve as attachment points for the front half of the housing.

thingiverse

free

Core XY D-bot cube 3d printer by sergey2484

...d-heat-bed-mk3-standard-aluminum-plate-3mm-hot-bed-reprap/1941580634.html?spm=2114.10010208.1000016.1.6khine&isorigtitle=true

thingiverse

free

LED laser engraver by shura2000

...ера используется длинный винт м5 и гайки м5. одна с капроновой вставкой. прошивка grbl 1.1f отсюда: https://github.com/gnea/grbl

thingiverse

free

Anchorable Shelf Leg for scrap wood shelf by Robert_White

... with wood screws. it's plain! it's boring! it's unremarkable! 15%-25% infill is plenty strong for most applications.

thingiverse

free

Basic Bowden Extruder V2 by FerociousDesigns

...ing the arm. to set the extruder gear into the right position on the shaft, you can attach the built arm without the front plate.

thingiverse

free

Simple Bowden Extruder by FerociousDesigns

...n your printers tolerances. the m3 hole in the 'right' piece may need to be made slightly larger to ensure free movement.

thingiverse

free

QUINTA CNC AB 5-Axis Head by Quinta_CNC

...7mm-with-5mm-er11a-extension-rod-motor-shaft-holder-c/233525166034?sspagename=strk%3amebidx%3ait&_trksid=p2057872.m2749.l2649

thingiverse

free

Firefly Special by FDMBot

...this part easily without soldering if you like my work, if you want to see new designs, you can donate any amount for a filament.

thingiverse

free

One Hand Electric Can Opener Modification

...ck - initial work - akmjoe license this project is licensed under the creative commons license - see the license file for details

thingiverse

free

X5S MGN12H Linear X & Y-axis with modular hotend mount

...assure and make up an opinion of what will work best for you. or just test which of the length's that suit your printer best!

thingiverse

free

OpenSlider - Motorized Camera Slider by RJ_Make

...er: https://twitter.com/rj_make thingiverse: https://www.thingiverse.com/rj_make/about facebook: https://www.facebook.com/rjmakes

thingiverse

free

CR-30 BMG NF Crazy Direct Drive Mod (with 11% more build height -> 190 mm, volcano characteristics) by marvin_bauch

...just like it was designed to: using the two bores (13 mm distance) which do fit the unmodified mounting...

thingiverse

free

SMuFF Wiper + Purge Bin for Ender-3-Pro by technik_gegg

...of maker wingforce. so if you're planning to equip your ender-3 with an v6 as well, head over to this thingy and have a look.

thingiverse

free

Fully 3D printed sailplane model. optimized for 0.2 nozzle (weight reduction) by grafalex

...of sanding is required. i uploaded these files with experimental* prefix. please send me a note if this approach works for you.

thingiverse

free

Anet A8 Pen & Scraper Holder by ShaneAPowell

...c_pfcba (short cip of pcb isolation routing). july 14 2018: added small hole recesses to base for more common 20mm length screws.

thingiverse

free

Gavtech™ Dual Drive Bowden Extruder v1.1 by FerociousDesigns

...orks best for me. i have some other springs with thicker wire which are just far too stiff for it and cause jamming of the gears.

thingiverse

free

RK3D Tool Changer by Rajaa

...tps://grabcad.com/library/power-supply-19 e3d extruder by e3d e3d v6 hotend by tico - https://grabcad.com/library/e3d-v6-hotend-3

thingiverse

free

Spool holder (modular) base/clamp (for CTC and others) by brainwash

... 80c, which also cures pla. this makes parts stronger, so if you are printing without a hpb the parts might be under-dimensioned.

thingiverse

free

Working 4 Cylinder Air Engine Model

...ee what it can handle. i hope you enjoy this model and please contact me with any problems or questions at elismith427@gmail.com.

thingiverse

free

Laser Rotary Axis

... will tell if they are as good: https://www.amazon.com/gp/product/b07vxq83r9/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=utf8&psc=1

thingiverse

free

3D-printable linear actuator by Bribro12

...: https://www.thingiverse.com/thing:2470882 best 3d-printable bearing: https://www.thingiverse.com/thing:2349065 have a nice day!

thingiverse

free

Axial Hotrod (V5) by Voodoobrew

... current version, its a hacked together file with excessive junk all over it, but that's my workflow. https://a360.co/2vtigru

thingiverse

free

E3D V6 Extruder Head Assembly With Cardan Shaft Direct Drive by astfaellergerald

...g vollständig ausgeglichen, deshalb ist darauf zu achten, daß die hebelarme zweier kardangelenke immer exakt in einer linie sind.

thingiverse

free

Serious business Bear MK2, MK2.5, MK3 y-axis replacement by zbrozek

...2019-01-01 uploaded fresh source and added some printability features to the motor mount. 2019-02-21 updated the e3d idler slide.

thingiverse

free

Desert Eagle .50AE

...ecoil springs, and slide locking lever...are going to be nuts! but i'm up for the challenge! so we'll see how it works.

thingiverse

free

Plastic Monstrosity -- The 3D Printed CNC for 4x8' Plywood by spiffcow

... have a shorter shaft. the belts are closer to the motor, but the new end supports take up an additional 30mm on the short axis.

thingiverse

free

Raspberry Pi 4 Mini Desktop Case - Ice Tower Cooler + Secondary PCB Cooling Fan by JISpal01

...e board warping, damaging the pi. that's probably not a concern, but i thought i'd offer this change as an option anyway.

thingiverse

free

Buratinu Maxi 2000 by wersy

...ng the construction of the 2000 (half-shell, skid reinforcement, extended fuselage) and the many helpful suggestions - thank you!

thingiverse

free

QU-BD OneUp/TwoUp Full Redesign by Jeepguy42

...r attached. be aware i haven't tested this anubis guide so it may have issues that i'm not aware of. use at your own risk

thingiverse

free

200 Watt Bluetooth 5 Speaker Boombox *Source Files Included!* by morganlowe

...ion straps for it. update 3-7-2018 finished the final touches and uploaded the solidworks source files for easy customization..

thingiverse

free

Silly super Mario bros level by Linkstr3000

..., twist = 0, slices = 20, scale = 1.0) polygon(points=[[0,0],[75,40],[40,75],[10,10],[80,10],[10,80]],paths=[[0,1,2],[4,5,6]]); }

thingiverse

free

DIY MMU2S clone

...1-3-control-board-32-bit-arm-cpu-32bit-board-smoothieboard-3d-printer-parts/32980090169.html?spm=a2g0s.9042311.0.0.27426c37hdt5ir

cg_trader

free

Sheave 25 OD 38 Bore

...sheave 25 od 38 bore cg trader sheave 2.5" od, 3/8 bore

grabcad

free

10 Tooth #25 Sprocket with 1/4" Bore

...10 tooth #25 sprocket with 1/4" bore grabcad 10 tooth #25 sprocket with 1/4" bore for use as an idler