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icon5.gif  Volume (price) calculations don't appear trustworthy [message #1866] Mon, 03 November 2008 10:21 UTC Go to previous message
avatar Xcapee  is currently offline Xcapee
Messages: 12
Registered: October 2008
Go to all my models
Junior Member
Ok - I have to say that the pricing policy is great - only paying for volume printed. It's just that I don't trust the volume calculations.

I have uploaded a design stage by stage, and the price (volume) calculations don't make any sense.

All prices quoted are in WSF

The first part, an empty tube with 1mm thick walls, ID = 35mm, OD = 37mm and height 23mm costs $4.86 which equates to 2.6 cm^3. This is the correct volume.

Cylinder model
/modules/udesign/utils/openfile.php?id=8122&f=8122_small.jpg

Add a ring of warped text to the top of it, thickness = 1mm, height = 7mm. If it weren't text, but a solid cylinder it would have a volume of 0.8 cm^3. Since it is text, it should be a lot less than that. However the price for my original cylinder plus text ring is now $10.17, or a total of 5.4 cm^3, more than double the volume and cost of the plain cylinder alone.

Cylinder plus text ring
/modules/udesign/utils/openfile.php?id=8112&f=8112_small.jpg

Something funky is going on with the text volume calculation.

It gets worse.

If I add a ring of text around the original cylinder (not on top of it) so that the effect is embossed text raised 0.5mm, that should add much less than 0.4 cm^3 but it adds another 2.8 cm^3 or 2.9 cm^3 (I have two such embossed text rings).

So my final model is being priced at $20.91 when the price should be well less than $10. Probably less than $7.00.

/modules/udesign/utils/openfile.php?id=8120&f=8120_small.jpg

It doesn't really give me much confidence in the pricing for more complex models.

Would anyone care to explain what's going on?


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