MTester Remix from DomesticHacks

Last crawled date: 4 years, 3 months ago

-- READ THE PRINTING TIPS BELOW FOR BEST RESULTS --
I love the design of this case from DomesticHacks, especially because it has a nice little cradle for the SMD test spot where the parts won't fall into the innards.
However, some of the part tolerances were very tight, and I wanted the top to be shallower, and the bottom to be square so it would rest nicely on the workbench. In addition, the 9v battery was a super tight fit, so I enlarged that space a bit.
I imported the DomesticHacks .STL files into F360 and re-sketched some of the parts to add 0.25mm clearance on the battery door. I also trimmed the height of the battery door by 0.25mm to account for the inevitable bridging droop when printing.
NOTE: I HAVE NOT YET PRINTED THE NEW SLIGHTLY-MORE-SNUG BATTERY DOOR. I printed mine with 0.30mm clearance and it's a little loose, so I brought it down to 0.25 and it should be perfect. Should being the operative word. YMMV. Mine is plenty good enough so no need to print another yet. If it is too snug for you, and you have Fusion360, you can adjust the clearances on the Fx Parameters page.
HUGE THANKS to Domestic Hacks for the starting point for this project!
PRINTING TIPS:
This is best printed at 0.25mm layer-height.
Print the back with the bottom on the print bed. Use supports for the battery compartment and the nut holes. I used 10% grid infill for this part, 5 top & bottom layers, and 4 perimeters. The 4 perimeters is important to prevent the nuts from camming out.
Print the faceplate/cover with the top on the print bed. (you'll need to flip it) Use supports for the SMD part "bridge" and also for the screw-holes. I used 15% infill for this part 5 top & bottom layers and 4 perimeters.
Print the battery cover with the bottom on the print bed. 5 top and bottom layers and 4 perimeters,. 15% infill.
IF YOU PRINT ONE, I'D LOVE TO SEE IT!
ASSEMBLY TIPS:
Rather than risk camming the nuts, I used a flat punch to gently tap the nuts into the tighter sections of the hexagonal holes.
Trim any "elephant's foot" sticking out around the battery cover and port.
A little CA glue holds the 8mm x 3mm magnets perfectly.
FUSION 360 NOTES:
I've documented most of the bodies and sketches. It's a hack in many ways, since F360 doesn't deal with interfaces between faceted mesh surfaces and it's own "perfectly-formed" surfaces, ...but it works.
If you do a remix, please post the source too!