The Mars Lander model rocket was introduced by Estes in 1969. It featured shock-absorbing landing gear that allowed it to land upright without damage (usually). When Estes stopped making the kit, Semroc began offering a nearly identical replacement kit that is still available today.
This 3D-printable reproduction has the advantage of allowing easy replacement of the springs/rubber bands used on the landing gear - something that was difficult to do on the original. Most parts connect via twist-lock fittings. Only the landing pads (feet) need to be super-glued together and glued onto the landing gear (legs). The landing gear shown are red PLA and everything else is white PLA, with the pads spray-painted silver.
I have not flown this model, but I have included features that should make it possible. There is a shock-cord attachment lug inside the rocket, just below the nose cone base. There is a launch lug tube that runs the entire length of the rocket that should accept a 1/8" launch rod. The ejection baffle should protect the parachute somewhat, although, depending on the material used, it may need replacing after one or more flights.
An engine mount tube with centering rings would need to be built, with rings spaced so the entire mount is held in place between the ejection baffle and the flange on the bottom of the lower core tube. If standard model rocket materials like wooden centering rings and paper tube are used for the engine mount, it would ensure that it could withstand the heat of the engine. You could design and print an engine mount if you select material that can stand the heat, or be prepared to replace it if it warps.
Note that the price you pay for easy assembly/disassembly is a heavier rocket. Even though it is 1:1 scale, the PLA-printed one came out to 6 oz compared to 3 oz for the balsa/paper model. If you fly it, you will need to adjust engine rating accordingly, and check the CG/CP relationship. The site linked below has some RockSim info to help with that.
The embossed patterns on the ascent stage should be deep enough to survive sanding and painting. The embossing on the cardstock wraps on the original kit was fairly shallow.
Semroc kit available here:
https://www.apogeerockets.com/Rocket_Kits/Skill_Level_4_Kits/Mars_Lander
Decals available here:
http://www.erockets.biz/semroc-decal-mars-lander-sem-dkv-54/
Rocksim info:
https://www.rocketreviews.com/estes-mars-lander-plan.html
Printer Brand:
SeeMeCNC
Printer:
ORION Delta 3D Printer
Rafts:
No
Supports:
Doesn't Matter
Resolution:
.2mm layers
Notes:
See uploaded zip file with Slic3r settings for each part.
See photo for how to orient the parts on your build plate to avoid need for support.
The landing gear have an axle slot that needs to face upward for printing
Follow the diagrams that show the four steps for installing the landing gear.
