This is a nonlinear camera slider which I designed in Open-SCAD based upon the idea of pantograph arm which constrains the movement to the same distance in two axis at the same to result in a fluid motion of the camera.
Parts Required to build:
8 - 608zz bearings: http://amzn.to/2mfjnaG
2 - 1/4in 20 turn 45mm long cap head Allen bolts (other head type might work)
2 - 1/4in 20 turn nuts (these go in the tripod base its being printed)
2 - 1/4in washers
1 - 1/4in 20 turn 75mm long cap head Allen bolts (other head type might work)
1 - Small ball head camera mount: http://amzn.to/2mfu6C5
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Just Any Printer 200mmx200mm
Again this print pretty easy with minor cleanup afterwards, however you should use supports in the printing process. Also you will need a vice to press fit the bearings and you should use a cleanup tool (link here: http://amzn.to/2n84hkV) to slightly tapper the opening for the press fit. Also when printing the tripod base, you will need to pause the print around layer 49 (if using 0.3mm as the layer height) to insert two (I used stand zinc) 1/4-20 turn nuts, on for the tripod and the other for the arm.