I made a 3D printer more or less specially to print kayaks. I printed up to now 7 kayak prototypes. I use a 1.8mm nozzle and 0.6mm Layer height. We have to add a layer of fibre glass to reach the final stiffness.
I print in spiral vase mode and it take around 2 days to print a 280cm kayak. Its printed in 3 segments plus nose and stern.
More infos on our blog:
https://6brueder.wordpress.com/
(there is also the link to the CAD-Data)
The printer has the following specs:
-printvolume: 1000x550x1100mm3
-footprint 1170x770mm2(europalett)
-1.75mm DualHotend automated selectable for two colours or soluble material
-Duet Mainboard 6HC and Toolboards
-CAN-Connection to printhead – to reduce cabeling
-closed housing
-all motion parts are metal(except the belt)
-Wi-Fi
-integrated webcam useful for multi day prints….(based on raspberry pi)
-automated z-axis leveling of all z-axis
-meshbedleveling
-external cooling air for the printhead
-printhead can be easily opened and removed with 4 screws and 3 connectors – for external -maintenance
-no milled parts – just lasercutting and printed
-Corexy motion system
-mostly internal cabeling
-1500W heated bed made of 10mm Aluminium with 5mm glass
-z-axis geared 5:1(but belt driven – in my opinion ok for large format
-width can easily reduced(removing some external parts) to standard 80x200cm roomdoors
-Hermera Extruder – open to other products
-Mosquito Hotend
-Big Hotends with up to 1.8mm Nozzle size for high layer heights
-Corexy
-all steppers are outside the housing for better cooling
-printhead is cooled with external air
-target accuracy +-1mm in all directions….
-3000€ material costs
-easy to build
-mostly no cheap parts from china-
-filamentrunout sensor
-chamber temperature sensor
-automated cooling fans