BRILL/ALKO Lawn Mower Gear Pinion (Sperritzel)

My good old lawn mower (push-mower BRILL RazorCut Premium 38) didn't work any more properly, because one of the gear pinions (Sperrritzel) was a bit worn and the wheel didn't drive the spindel reliable any more - it stopped every now and then.

BRILL was meanwhile acquired by AL-KO who still sell the RazorCut models under the new name, i.e. it should be possible to get spare parts, but they are not really cheap and some shops don't have them any more.

If you still want to buy them, look for part numbers B00479/B00464 or ALB00479/ALB00464. These mark part 17L and 17R of the diagram.
But of course you can also print your own :-)

I realized, that there is no obvious reason for the ring holes top and bottom, so I removed/filled the top one and reduced the lower one for more stability. And to compensate for the middle-base sticking out at the bottom (which prevents proper 3D printing), I cut off a slice and just printed a 1mm washer, which doesn't have to be glued, but is simply mounted before the tappet.

Make sure you print the correct version left or right (which are mirrored)

Printing tips: Use any “strong” material (I used PLA+) to avoid wearing especially on the inside. Infill density is probably not so important, but I increased the number of shells to improve strength.