If you own one of the many models of Parkside Robot Lawnmowers (PAMR, A1 etc), at some point you have probably tried to find blade replacements, only to despair at the insane prices.  After buying a pack of 18 blades and screws from Ali for around £4 (enough to keep me going for life!), only to find out they don't fit the Parkside, and the original screws are too thick for the cheap blades.

So I worked on a solution, and also an improvement.  I noticed some of the Husqvarna Automower/Gardena Lawnmowers have six blades on their mower disc, so that seemed to be a good option for the Parkside too! 

I would recommend you don't print this in PLA (but who knows, it might be fine), instead PETG, ASA, ABS etc, or some hard wearing engineering filament.

I printed mine upright on the plate, so far it seems to be holding up well, but it would be more logical to print flat on the bed I think, it would surely be stronger that way, although separating from supports might require some work.  Perhaps an interface layer of PLA would be the way to go.

I have included 3,4 and 6 hole plates, so you have plenty of options.

I fitted mine with metal threaded inserts (M4), but I suppose if you don't want to go that route, a small bolt with shoulders might work just as well, don't forget your thread locker! You could even use an M5 threaded insert if for some reason you wanted to keep the original Parkside blades.

I know its so popular for 3d printed part designs for this mower to be for sale on other websites, but I wanted to keep this free for everyone, so I have turned of the remix/commercial permissions, your feedback really would be appreciated if you find these useful.