RepRap Extruder for Tamiya Universal Gearbox

by vik, published

RepRap Extruder for Tamiya Universal Gearbox by vik Jul 2, 2009
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RepRap Extruder for Tamiya Universal Gearbox by vik is licensed under the GNU - GPL license.

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This is a design of the RepRap extruder drive that is compatible with the Darwin quickfit clamp system and the Ponoko lasercut kit. It will take either 16mm PTFE or heatsink based heaters. It is designed to be made with no lathing or machine tooling. An opto sensor may or may not be fitted to regulate rotation speed - I found that this was definitely required with an all-metal heater assembly. If you develop software to do that, we'd love to see it!


The design uses a 50mm M5 drive screw which can be cut from an M5 bolt. Coupling is by an M5 grub screw lock-nutted to the top of the drive screw; a 2.5mm hex key replaces the Tamiya output shaft and docks with said grub. Filing the point off the end of the grub screw will make it easier to fit.

You'll need an assortment of M3 nuts, bots & washers to assemble it. Put springs under the 4 screws holding the filament and screw holders together so that compression is maintained as per the original RepRap screw extruder on the RepRap wiki.

There is a cavity in the screw holder to take another locknut and two washers that are used as a thrust bearing. The drive screw is also supported near the point of contact with the filament by half an M5 nut which has been drilled out to 5mm. With luck, anyone should be able to source these components worldwide.

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It printed up nicely. I just need to make another extruder head and finish up my homemade optocoupler. For us US types, 4-40 hardware will work for the M3, but it is worth looking for the M5 that Vik suggests. I just wish that I could find a longer nut for the interface between the M5 grub nut (with the hex hole) and the M5 bolt. I can only get one thickness of M5 nut around here, apparently.

It was worth printing out just to see all the clever 3D features, like the holes to hold the opto board, which are printed at 45 degrees.

Good work!!

VIK once again displays his RepFU.

Nice Work vik , at least you are in the superior hemisphere :)



Half-hearted attempt at an interrupt-driven speed controller firmware for a single opto endstop as a speed controller.


It works for the BitsFromBytes encoder wheel : it probably needs some tweaking for the timings for this version.