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Load Carrier for labour

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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.

Load Carrier for labour[edit]

Project developed by Dhwani
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.


In the undeveloped countries , there are large number in people who are engaged in labour work. They carry tonnes of weight everyday for wages. This project , has been designed to help such people. The load carrier is designed in such a way , that the weight of is evenly distributed and the laborer would not get tired. It is 3 Way load carrier which functions as a trolley, as a overhead load carrier and also as a backpack.

  1. Load carrier for labour
    Load Carrier for labour.JPG
  2. Overhead Load carrier :
    Overhead Load carrier.JPG
  3. Load Carrier as a Trolley
    Load Carrier as a Trolley.JPG
  4. Load carrier as a Backpack
    Load carrier as a Backpack.JPG

the STL files are available on " "

Bill of Materials[edit]

  1. 8 "1 inch "PVC pipes( 1 feet each ): 0.5*8=4 $
  2. 2 "1 inch "PVC pipes( 2 feet each ):0.5*4=2 $
  3. 8 bolts: 1/4 inch diameter with approx 5 cm length: 30 cents x 3 = 0.9 $
  4. 8 Nuts that fit into those bolts: 17 cents x 3 = USD 0.51
  5. bearings( skate board bearings would work) :2*1.25=2.5 USD
  6. PLA filament: Approx 260 grams = 5.72 USD

The STL files and FreeCAD files for the parts can be found here:

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer

Skills and Knowledge Necessary to Make the OSAT[edit]

  • Knowledge of FreeCAD, Opensscad and Cura

Technical Specifications and Assembly Instructions[edit]

- To Assemble: -

  1. Download the part files provided above in the bill of materials
  2. Convert stl files to gcode using software like Cura
  3. Print all of the Parts
  4. Attach the bearings on the gear shaped parts. Then attach the gears to the connectors which have 8mm rods( there are only 2 of them).
  5. Connect the interlocking parts as seen in picture. Connect all L shaped parts at the joints.
  6. Connect the 4 Clamps with two holes and use nut and bolts to fit them.
  7. Connect the U shaped printed parts to the clamped portion.

- Time:

  • Total print time estimate: 10 hours
  • Total assembly time estimate: 30 minutes

Common Problems and Solutions[edit]

  • One must be careful of your printer radius and calibration as a couple of those parts only just fit into my Delta: check how thw first couple of layers print and shrink the models if needed (all be same amount)
  • Sticking to the bed could be a common problem in case of such large prints: Use high quantities of washable glue on bed before printing
  • Please use high infill for printed parts or they may not carry the required load

Cost savings[edit]

  1. Cost Estimate: USD 13.5$
  2. Equivalent products in market cost:Not available in market.
  3. Net savings achieved:


  • For the inspiration of this design see: Quora " simplest yet amazing innovations page"

See also: [1] and video