Costing out the Plaster Magnets

Averaging Plaster Weights

Now that I have figured out the perfect mix to use when I’m making plaster magnets, it’s time to start figuring out their actual costs so I can get all the prices in the Etsy store updated! ūüôā

Per my plaster mix experiment post 20ml plaster = $0.28

Since most of my magnets are tiny, my attempts at measuring how many ml of mix went into each were a dismal failure. So instead, I went with an average weight.

I piled a bunch of the casts onto a postal scale and then calculated the average. Once I’ve worked through all the bodies I have, I’ll make a few 10 item batches of each small mold to measure how many ml are used.

The kittenloaf used 20ml and the average weight is 0.7oz, so I’m using a 1oz = $0.40.

Magnets will be added as I work out the costs, so not all of them will appear here at first…

Last updated: 05/11/2017

 

Kittenloaf (Sleeping Cat)

  • Average oz = 0.7
  • Plaster¬†cost @ 0.40 per oz¬†= $0.28
  • Primer, paint, and sealer $0.15
  • 0.7 inch Neodymium =¬†$0.53
  • or 1 inch ceramic = $0.33
  • Total materials = $1.11/0.91
 

Leaping Horse

  • Average oz = 0.04
  • Plaster¬†cost @ 0.40 per oz =¬†$0.012
  • Primer, paint, and sealer $0.15
  • Ring Neodymium = $0.33
  • Total materials = $0.45
 

Flat Cat Head

  • 0.03 average oz @ 0.40 per oz = $0.12
  • Primer, paint, and sealer $0.15
  • 3 inch tape magnets @ 0.04 per inch = $0.12
  • or 1 inch ceramic = $0.33
  • or 0.7 inch Neodymium = $0.53
  • Total materials $0.39/0.60/0.80
 

Large Horse Head

  • Average oz = 0.06
  • Plaster¬†cost @ 0.40 per oz =¬†$0.24
  • 0.7 inch Neodymium =¬†$0.53
  • Total materials = $0.77
 

Heart Horse

  • Average oz (head+mane)¬†= 0.08333
  • Plaster¬†cost @ 0.40 per oz = $0.03
  • Primer, paint, and sealer $0.15
  • Wooden Heart = $0.19
  • Tape magnets 2 inches @ 0.04 per inch = $0.08
  • Total materials $0.45
 

 

Corgiloaf (Sleeping Corgi)

  • Average oz = 0.5
  • Plaster¬†cost @ 0.40 per oz =¬†$0.20
  • 0.7 inch Neodymium =¬†$0.53
  • Total materials = $0.73
 

Clydesdale Head

  • Average oz = 1.0
  • Plaster¬†cost @ 0.40 per oz =¬†$0.40
  • 0.7 inch Neodymium =¬†$0.53
  • 6 inches of Tape Magnet = $0.30
  • Total materials = $0.93/$0.70
 

Small Horse Head and Mane

  • Average oz (head+mane)¬†= 0.08333
  • Plaster¬†cost @ 0.40 per oz =¬†$0.0333
  • 1 inch Tape Magnet = $0.04
  • Total materials = $0.07
 

Small Bird Head

  • Average oz = 0.0333
  • Plaster¬†cost @ 0.40 per oz =¬†$0.012
  • 0.5 inch Tape Magnet = $0.02
  • Total materials = $0.04

Cost of Magnets

  • 07004 1 inch diameter ceramic magnet $1.98/6= $0.33
  • 07090¬†3/8 in. Neodymium Rare-Earth Magnet Discs $3.98/12 = $0.33
  • 07046¬†1/2 in. Neodymium Rare-Earth Magnet Discs $3.98/6 = $0.66
  • 10102256 ArtMinds¬†Wood Hearts $3.89/21 =¬†$0.19
  • 0.7¬†Neodymium Rare-Earth Magnet Discs $3.98/3 = $1.32
    Or on Etsy from MinkusMargo for $26.43/50 = $0.53
  • N40.¬† 0.125″¬†(3.175mm) dia x¬†0.0625″ (1.587mm)¬†thick, magnetized through the thickness. from SuperMagnetMan¬†for $20.00/100 = $0.20
  • Magnum Magnetics Pro Mag Round Magnets 0.75″ dia for $6.99/50 = $0.14

The magnetic tape I am using is this one from Home Depot (1/2 in. x 10 ft. Iron Ferrite Magnetic Tape @ $3.98). Which breaks down to roughly $0.04 an inch. One 2.5 inch strip is enough to hold three pieces of paper and for most of the forms I’m using multiple strips.

Martha Bechtel

My name is Martha Bechtel and I write fantasy and science fiction stories, paint small model horses silly colors, cast resin and plaster magnets, code random code (and Wordpress plugins)... Come on in and join in the fun!