Needed a very tiny chamfer plane to do some tricky to access corners - this was the result! Works a charm on plastic such as HDPE.

Thanks to the slot in the blade, depth is adjustable - you could probably use it as a tiny block plane if you wanted since the blade at full extension is lower than the base.

You'll need a Swann-Morton No. 17 blade (X-Acto #17 looks very similar, but I don't have one to measure so can't promise it'll fit), an M2.5 screw at least 5mm long, and an M2.5 nut.

Print lying on its side, no supports required.