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Modular Coral Regrowth Post

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MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.

Project Title[edit]

Project developed by Ryan Lester
Project Title is Coral Regrowth Modular Post
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.


With recent destruction of coral reefs due to marine pollution, there are movements within marine biology for conservation efforts of coral. When coral breaks off of its reef, it can regenerate if placed into a nourishing environment. To ashe sist with efforts to help grow these rare corals, I created a modular post that can be used to hold pieces of coral while they regrow. The posts are of a modular design, and can be built up to allow for more coral to be placed on a single vertical post. The rods slide through the post, and with string tied to the holes on each rod, are tied to the coral so it doesn't move. A weight is tied to the lowest rod in order to keep the vertical posts in place and prevent them from floating.

Completed Assembly|Image: Mod Coral Regrowth Post.JPG

Bill of Materials[edit]

OS CAD files and STL's available:

  1. Regrowth Rods
  2. Regrowth Modular Post

Other Pieces

  1. Weight with string for attachment (Heavy object that will sink)
  2. 2x String/rod (Approximately 5 in. long)

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Sandpaper, drill with variable drill-bits (Clean-Up of parts)
  3. Hammer/Mallet (just in-case rods need more help)

Technical Specifications and Assembly Instructions[edit]

  1. Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description.
 1. Print the post and at least two rods
 2. Sand down pieces so rods fit into the post
 3. Slide the two rods into the post
 4. Tie the weight to the lowest rod
 5. Tie string onto holes of highest rods (vary rod locations when using more post)
 6. Tie coral to string
 7. If more coral is acquired, print more posts and rods and repeat Steps 2-6 (skip step 4 and make sure to sand the connections for the posts)
  1. Print Time Estimate:
 Rod: 1 hour 19 minutes (70mm/sec, 10% infill, support generated everywhere)
 Modular Post: 4 hours 25 minutes (70mm/sec, 10% infill, support generated everywhere)
  1. Include assembly time estimate
 With clean-up, assembly should take less than 15 minutes

Common Problems and Solutions[edit]

  • The vertical post more than likely will not fit into one another directly after printing. Light sanding will more than likely be required on edges to enable a quality fit.
  • The sanding will have to occur on the rods as well. If the holes on the post are not large enough, ream them with a drill-bit.

Cost savings[edit]

Rods are roughly 15g (10% infill) and Post are 73g (10% infill). Given an approximate cost of $0.04/gram, one set (one post and one rod) cost close to $3.50. There does not seem to be a commercial equivalent currently.

Benefited Internet Communities[edit]

[1] [2] [3] [4] [5]


  • The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <ref> </ref> and <references/> tags and can be in any format but should include all the information necessary for someone else to find the same information you did. For example: [1]
  1. web page: Department of Energy (DOE) Landscaping and Energy Efficiency, DOE/GO-10095 (1995) Available: http://www.eren.doe.gov/erec/factsheets/landscape.html

Based on the developmental needs addressed (e.g. food, heat, electricity, clean water, health care, etc.) be sure to label your device in the proper categories e.g. use [[Category:Water]]. Be sure to categorize your device so that it will be easy to find – for example “Low voltage connection basics” is categorized in [[Category:Environment]]