I've came from creative area so it was a chalenge for me either and still is
I think that a good start point is know your operational cost per month. You also need to calculate how long you want to refund your investiments and dilute this value for a certain period, one or two years, something like that.
You should check how much your competitors charge and 3dhubs can indicate it to you.
I would like to have a spreadsheet with all my filaments, resolutions and costs, I will make it just need to find someone with skills (my bastard brother-in-law) to help me ... but basically I have a setup cost to fix the STL, when possible, and to slice parameters (I´m using Simplify3d so sometimes it's quite a hard work with multiple profiles). An then I add my resolution cost. Normally I use 0.1mm as a standart resolution that I work 60% of the time. For 0.2 resolution I gave a "20% discount" and for 0.06-0.07mm I increase by 20% with no count just market perception. With my operational cost and filament cost (UM PLA from BR UM reseller is U$115) my 0.1 resolution is relative of 7 or 8 times filament cost of a print.
I really wanna introduce a parameter of retractions cause if the print retracts a lot it is propense to fail such as underextrusion so it can cost more or it can take longer to finish with lower speeds and higher temps. Equipament degradetion should count to, higher temps burns coupler and abrasive filaments kill your brass nozzles.
Post processing is also tricky to define but I include a basic sanding and for priming, painting, wax coating and smoothing services I add more bucks.
Since I started to print with variable layer high it's harder to setup the cost, I need to calculate for exemple: 35% at 0.2mm; 40% at 0.1mm and 25% 0.07mm. I really would like to automate it. It's good to be transparency with the costs to get loyal customers.
I hope that helps and I will keep my eyes on this topic to learn more about it 8)
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jameshs 42
If I am doing a one off for a friend then I charge nothing - but I make it clear it is a one off.
If it is for an unknown person then it is a complicated set of questions
How do you value your time
How do you value your machine time
Machine time is easy - write off the machine plus spares plus maintenance over a three year period. Allow for 35 hours of printing a week - then do the maths
Your time - well, I assume you are not currently a full time 3D printer ... if you want to be then divide the salary you want over 35 hour week, plus taxes, plus overhead and you have an hourly rate. Use this for set-up time, computer time, difficult part of print time and then things like client relations and packing.
However, you will rapidly find that what looks like a slightly poor injection moulded part is ending up costing $$$ - so most people would only pay that amount if they are prototyping or can't get the product elsewhere.
Or join the hobby printers who more or less do it for the price of filament.
There is no right answer, but I know when I used to do 3d hubs the price valued my time below minimum wage, hence I no longer do those, whereas the printer has been invaluable to me as a tool for my own work (architect) but not a money earner as a tool in its own right.
Hope that helps!
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