60 hours to print a Mendel, or 20 for a Micro Mendel is a Long time. Eventually you get sick of watching the printer print. You have 624 bearings, you have M4 socket caps, you have m4 bolts. Why not build a Yo-Yo?
Design file in HeeksCAD included, Boolean has not been done in design file so you can easily alter the design.
I have got it to return only once, but I am a dunce with Yo-Yos. Can you make it work better?
1 x 624 bearing
1 x M4x22mm Socket Cap
1 x M4 nut
2 x M4 fender washers RepRap Yo-Yo
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5.206 w x
5.206 d x
2.05 w x
2.05 d x