Can be printed in ABS PLA or PETG. ABS is my preference. If you are using PLA try to keep the fan off for the hull parts or else the sharp hull corners tend to lift a little. Use 0.15mm layer height for the impeller. Print with supports enabled. For all other parts I used 0.25mm layer height with a 0.4mm nozzle on my Original Prusa i3 MK2. The nozzle takes a 3mm inner, 4mmor 5mm outer diameter teflon tube as a bushing for the shaft (check the last two pictures above). I cut 5mm off some spare bowden tube and used this. Teflon is a very durable and low friction material - perfect for use here. Bill of Materials: - - Weight of printed parts: 550g (PLA), 460g (ABS) you'll need a bit more than that because of required support material - M3 misc screws - 6x self tapping screws 10mm long or so - 1x 105mm long, 3mm stainless steel rod as driveshaft. To mount the impeller securely I ground a flat on the shaft, sanded the rest of the area that was doing to contact the impeller and super glued it in place. - 1x 623RS bearing (623ZZ is also fine but rubber seal is of course better when water is involved) - 1x 750mm of servo pushrod wire (most of it is used as a water intake screen) - 1x flexible coupler to go from motor to the driveshaft. I used 3 to 5mm universal joint adapter. Most 36mm diameter motors use 5mm shafts. I would recommend a universal joint which can be found for $1-2 on aliexpress. You could print your own universal joint or direct coupler (both are printable and included in files). Electronics: - 1x 9g servos - 1x Motor + ESC I'll be using this motor: https://hobbyking.com/en_us/turnigy-xk3674-1900kv-brushless-inrunner.html And this ESC: https://hobbyking.com/en_us/hobbyking-120a-boat-esc-4a-ubec.html My reference told me to pick a motor/battery combo that delivers up to 20,000 rpm and can handle about ~75A continuous. Refer to: https://www.kehrer-modellbau.de/en/kmb-jet28/jet-drives/kmb-jet28-rev.-3-with-short-steering-nozzle Included in the files are mounting brackets for 36mm and 28mm diameter inrunner motors as well as a mount for common airplane motors using 19mm hole spacing. - 2x lipo batteries. You'll want two: one to place in either side of the motor for balance. I will use 2x 2200mAh 3S lipo batteries. I like to use velcro to hold batteries in place. I feel its a bit on the heavy side so lighter batteries wouldn't hurt - 1x transmitter/receiver set. I will be using my Flysky i6 setup. If you have any questions, please do ask!