Turn Full Preview On
When working with fillets especially, you should turn on the Full Preview, but turn on Full Preview wherever available.  This will allow you to know when the fillets will fail.  For example if you are selecting edges and the preview goes away, you know you should deselect that last edge because for whatever reason it will not create the fillets with that edge selected.  Basically it is a visual check to tell if the command will work or not, and best of all it is included in the software and requires little or no computing power to render. 

Apply Color Weldment Profile Sketches
When you create parts using weldments you might benefit if you change the color of the sketch for different thicknesses.  For example if you are working with 1 x 1 square tubing but different thicknesses, how can you tell them apart unless you check the thickness?  A quick way to visual know the thickness is to change the profile sketch color and then resaving the file.  Once you insert the profile sketch in to the weldment part, make sure you show the profile sketch and presto, you can now see which tubes are what thicknesses.

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