Recommend using a generous brim!
Recommend printing in ABS with an enclosure if possible! PETG may also work
55% infill indicated about 1 kg of filament while slicing, but there was about 20% of the roll left so you should be able to increase the fill amount slightly.
Recommend using acetone welding to connect the two pieces and the pins (epoxy if printed in different materials).
*Note the tighter the pins are the stronger the connection will be, so start by printing the single pin at scale and see if the size should be adjusted +/- 1 or 2 percent for tight tolerance.