Low Profile Squash Ball Feet for Prusa MK4/S, MK3.9/S, MK3.5/S & i3 MK3/S/+

I liked the look of @Yosuke's Squash Ball Feet , but the added height compared to the stock feet (~10mm) made the MMU3-to-extruder tube rub against the ceiling of my enclosure just a bit too much, so I loaded in the model in Fusion 360 and started tracing some measurements for a low profile reimplementation. This is the result. I can't notice any difference in noise/vibration performance compared to @Yosuke's original.

Getting the ball into the holder is a bit harder than on @Yosuke's original, but a rolling motion and some patience does the trick.

Since the printer is heavier towards the rear, especially with the printer unmodified (i.e. with the PSU and spool holder still mounted to the printer) and with filament spools loaded, you might need to use different feet on the rear end of the printer. There are three different models available:

Base Use this for the two front feet, regardless of anything else.

For a printer in an enclosure, with the PSU and spool holders mounted elsewhere, they also work for the rear feet, but you might want to add a third pair of (the same) feet close to the rear pair. That worked well (enough) for my old MK3S+ in my Lack Enclosure v2.

+1mm (Untested) Raises printer 1mm compared to base model. Might be better for the rear feet of an enclosure-modified printer (PSU and spool holders elsewhere), but hasn't been tested, since I'm temporarily without enclosure. (Feedback welcome!)

+2mm Raises printer 2mm compared to base model. This seems to be about right for keeping the stock feet height on the rear feet of an unmodified MK4 (PSU and spool holders still mounted), at least with its spool holders loaded with full(ish) spools.

Required extra hardware (per foot)

- 1x Squash ball (double yellow dot recommended) - 1x M5x12 flathead bolt (non-flathead screws work, but can protrude more than the balls manage to lift). - 1x M5 T-nut for the 3030 profile (I can recommend this ) Differences from @Yosuke's original include (but are not limited to)

- Moved the ball further into the holder, and moved the outer part of the holder up slightly. The combination of these two lower the printer about 10mm compared to the original, which makes it just about the same height as the stock feet. - Incorporated @THS_148711's slot modification for easier installation. - Chamfered the screw hole (at the end of the slot) for a flathead M5. Update 2023-10-25: Re-exported the 3MF file from Fusion 360 with higher refinement (polygon count) for a smoother outer surface. Doesn't affect the actual print much, but does at least look nicer in the slicer. Also updated the uploaded G-code to this higher resolution model.

Update 2024-02-11 : Uploaded new variants in which the ball is moved slightly downwards, raising the printer. See table above for details on which model(s) to choose for your printer.