Kitchenaid Pasta Rolling Attachment

NOTES: 3D printing isn't a food safe process, filaments have unknown additives and colouring chemicals, brass nozzles can contain lead, and layer lines are shown to trap bacteria and cannot be adequately cleaned; as such this design is NOT safe for food contact without post processing such as proper application of a durable, food safe coating. Use at your own risk.

DESIGN IN PROGRESS: I'm still making some tweaks, currently the pasta comes out a little thicker than I'd like and if too much is fed in at once it can get into the gears so I'd like to add something to prevent that but haven't got around to it yet. 

BILL OF MATERIALS:

1x kitchenaid attachment shaft. I used this one but other options should work with some potential tolerance differences. remove the O-ring, it isn't needed and won't fit right

3x 608 ball bearings (printed bearings should work but tolerancing may be a battle, haven't tested them) 

1x end cap: printed

3x bearing shaft (+2x for each size of roller desired): printed (printing horizontally will be stronger, but fitment may be harder. vertical worked for me but your mileage may vary) 

1x drive end: printed (Supports needed) 

1x drive roller: printed 

1x desired size of roller: printed 

I've included tolerance tests and I highly recommend you use them before printing the full model as this design relies on friction fits. 

IMPORTANT FITMENT: for the fitment of the 608 bearings do NOT scale the drive end and end cap as this will affect roller spacing and drive shaft fitment. Instead use your slicer's hole compensation. bearings should fit tightly in the caps and be difficult or impossible to remove.

bearing shaft should fit snugly in the bearings inner bore but still be removable (to be able to switch out roller sizes) 

Rollers should be able to handle slight scaling to match the metal driveshaft. if this adjustment causes the bearing shaft to not fit then some sanding or glue may be needed.

USE:

Lightly flour rollers to prevent pasta sticking.

recommend starting with the coarse roller or rolling out somewhat thin by hand before using the fine roller. 

To switch rollers simply pull end cap off and pull the roller out (if fitment is good then the bearing should stay in the cap and the shaft should pull out of the bearing bore) then insert the new roller 

ROLLER SIZING:

pasta is somewhat springy and therefore the pasta sheet won't necessarily end up the same size as the gap between rollers, the pasta will likely be THICKER than the listed gap and I haven't done enough experimenting to tell you how thick the fine stage will get, but the gap between rollers are as follows:

Coarse: 2.75mm 

Fine: 0.75mm (should give a sheet in the vicinity of 1mm thick)